Improvement in jig-saws



THQMAS'BLANDIN, or CHARLESTQWN; MASSACHUSETTS. y

i y LTHoMAsBLANDINmf Charlestowmntheconnty Letters Patent N..104,410,'dated .Tu-ne 21, 1870rl The ScheduleLrferred to in theseLetters Patent and making part cf the same.

of M iddlesex and State ofMassachuset-ts, have invented certainVImprovements in Jig-Saws, `of which the following is a specificatie vtion.

` of.` bell-crank levers, l`c onneetingA-rods,

inaffer more fully appeal".

The ligure represents a side elevation of my inven- 'Ihis inventionconsistsin a peculiar'` arrangement and pitmen,

whereby a jig or `scroll-saw is operated, as will here- In the drawin yA represent-s the saw-flame, provided with the curved neck `a,circniarzt-able B, and legs, C.

7 Ou the end of neck a are the vertical ways D, in `whit-h slides thecross-head E.

-F F represent waysunder table B, and in line with x ways D.

`Hl is a crosshead,` which slides in `ways F.

`I represents the sawfwhich is vattached to crossheads E'and H, andpasses through the center of' i table B. y i i y 'Jrepresents abell-crank lever, pivoted at the end olf neckar, near cross-headE. l""One armof said lever is connect-edv to said'crossl i V represents 4thedriving-shaft, which is provided head by the pitman P, while the otherarm is connected by rod It to the arm L of lever J. y `S is abell-cranklever, which is pivoted near crosshead H, and connected to thesame by pit-man T and to the arm M of lever J by rod U.

with pulley W, `and this latter is eccentrcally connectediby rod'X witharm KA of lever J.

The operation will vbe readily seen `to consist in the vibratory motionimparted to lever J by means of pul- .ley W, communicated through rodsIt and U to levers Y O S, and from thence to cross-heads E H and saw I,through pitmeu P T, these latter being pivoted, at one end, to saidcrossheads, and at the other-to said lever. The motion thus produced issteady and particularly easy, as the pitmen' P T4 allow the utmostfreedom of motion -to levers O S, yet, at the same time, operate the sawel'ectually.

It will be seen that when the pitma'n T is in aperpendicular position,the pitman P is inclined, as shown, and m'ce versa. This arran gementprevents an y deadcenters, and, consequently, any strain on the saw.

Having thus fully described vmy invention,

lVhat I claim as new, and desire to secure by Let Witnesses: t

CARROLL D. WRIGHT, CHARLES F'. BROWN.

